Hide by axis in the Graph Editor (multiple objects)
i am using 2.8 but i believe it's the same in 2.79 , in the graph editor you'll find magnifier with filed string called "f-curve live filtering string" type there what they called  like "X Location or just X Loc" etc and you'll get only the axis you want...u can see on the side how the string is written like rotation is Euler, type that and you'll get only the rotation of all objects...etc :)